Bobbin and method of making the same



July 12, 1932. R. N coRTHl-:LL v

BOBBIN AND METHOD OF MAKING THE SAME Filed Oct. l2, 1931 Patented July12, 1932 f ROBERT N. CORTHELL, CF AUBURN, MAINE BoB'BIN AND METHOD orMAKTNG THE SAME' Application'inea october 12,."'1931ivseria1 No;568,425.

This invention relates to afsewing machine shuttle bobbin which includesa tubular core, a thread mass, usually cross wound thereon, and a pairof discoidal heads covering and 5 conforming to the ends of the threadmass.

The object of the invention is to to provide I the vhub 4portiomofthevbobbin, v the tube constituting the inner memberjofsaid hub'pory ian improved construction whereby the heads are firmly secured in theiroperative positions, and the central or hub portion of the 1a bobbin,which'rotates onithe usual vcenter post of the shuttle, is reinforcedandthe-shuttle is rendered desirably substantial.

Of the accompanying `drawing forming a part of this specification, l5Figure 1 is asectional view of a partially completed bobbin constructedin accordance with the invention. s Y l Figure 2 shows in perspectivethe bobbin heads shown by Figurevl. -V

Figure 3 is a sectionalview showing the completed bobbin `andillustrating means n of the core, between the alnges 15,' inwardly whichmay be employed in completing it.

Figure i shows a plurality of incomplete.

bobbins assembled on a supporting rod.

Figure 5 shows in perspective an elongated tube from which thereinforcing inner tubes of the bobbin hereinafter described are severed.v

The same reference characters indicate the 30 same parts in all of thefigures.

In the drawing 12 designates the tubular core, and 13 the thread masswound thereon. 14-14, designate the discoidal heads which cover and areconformed to the ends of the of relatively thin tough paper suchV asvkraft paper, an'd'is of smaller diameter than the internal dia-meter ofthe core and of .such diameter that the endsof the' tube are within 5the head flanges 15.

,opposed pressing` members 18 jcontactingwith 'Figure The'adhesivecoatingonthetube Al5 .therefore contacts withthe coreso that enough topermit the setting .of theadhesive.

thread mass.l and may be madeof paper orV completes the bobbin and ispreferably made Y Before the tube ljis'inserted the iincomplete bobbin,its external surface is coated with glue or other suitable adhesive andafter 1166is inserted it is adhesively united tothe fiailges V15 andtheintermediate :portion Of the .755 c v internal surface ofthe tube, andreenforces tion. i,

'When the bobbin is in the condition shown f? 30 byFigure 1,'thfe tube-16\is-slightly spaced from the core 12. The bobbinfin this condi-l tionis Subj ected'to'compressing pressure preferably byA a well known coppressincluding theheads A 14L,janda spindle member l9zprojecting` into:vand internally supporting the y,inner tubef.l Thecop press acts toreduce the length ofthe bobbin and compress and change Vthe-,formofthethreadmass so thata-portion '79 of it bulgesinwardlyand presses theport-ion against the inner tube; 16, which is new rigidly backed thespindlemember191 as shown by 5 when theadh'esive solidifies7 or sets,the inner i .tube isadhesively united to the flanges 15 and kcore 12,the pressurebeingmaintained-long i T80 The vinn/,er tube not onlyreinforces the portion of thebobbin, `but provides'said por- `tion 'witha smoothiwall or bearing surface rotatableon'a center post.;

'Y Figure'showsan elongated-.tubularblankl85 i V16"#adapt'edito becut upinto aplurality of inner tubes 16.` Thetube laisgvplaced upon arod 21,`and an adhesiveY coating is applied to itsl outer surface. VPartiallycompleted bobbins, each including aV coreiy a"`threaded Y mass", andy apair of heads, but not anv inner tube,4 are then strung on the tube 16?. The tube V16a isftlien severed at points indicated by 'the dcttedYlinesv 22 vso that each bobbinY irll cludes an inner tube 16j"Thelianges 15 now e Vsuiiicieiitly adhereito the tubev to'permit-the'removalof the incomplete lbobbinV and its completion by the abovedescribed pressing A operation.

' n yviu' be Se@ that the die; ranges- 15, are

inner tube 16, and the adhesive uniting said flanges and the core 12 tothe inner tube, constitute means securely attaching the disks 111 to theends of the thread mass and to the end portions of the core, in suchmanner that the disksA are not liable to be detached.

Such detachment causes .much trouble to sewing machine operators `whenthe `.disksv are engaged only with the ends of the .core as by upsettingsaid .ends to form flanges overlapping the margins of central holesformed in the disks. When bobbins charac terized as last stated areused, several disks detached from the inner ends .of bibbins sometimesaccumulate'in the inner end ofthe bobbin case of the shuttle and have tobe removed -before a. full bobbin can be introduced.

A disk detached from the outer end ofthe jecting from the thread massand liable to catch thread unwound from the mass and cause breakage ofthe thread. A full or nearly full bobbin thus damaged has to bediscarded. l

I claim 1. A filled reinforced bobbin, comprising a tubular core, athread mass wound thereon,

d'iscoida'l heads covering andV conformed to the ends of the thread massandhaving central openings'suirounded by inwardly projecting tubularflanges inserted in the end portions of the core, and a reinforcinginner tube inserted in the anges and core and adhesively united to theflanges and tothe por- ,inner tubes from the support, and completing:the bobbins by pressure;

`In testimony whereof I have affixed my i' ROBERT N. CORTHELL.

signature.

tion of the core between the flanges, said inner Y tube constituting theinner.member ofthe hub portion of the bobbin.

2.V The'method of forming a .reinforced filled bobbin which consists inlapplying an adhesive coating to the external surface of'a reinforcinginner tube., winding a thread mass on a tubular core'of larger diameterthan the inner tube, applying to the ends of the thread mass and core apair of heads having central inwardly f vprojecting tubular flangesentering the ends of the cor-e, thereby forming an incomplete bobbin,internally supporting the inner tube, placing the incomplete bobbinthereon with theflanges on the end portions of the 'inner tube, exertingpressure onthe incomplete bobbin to reduce its length and changejthevform of the thread mass to press the core andlflangesagainst the coatedsurface of the .internally ysupported inner tube, and maintaining lthepressure until the coat-ing sets.

' 3. The4 improved step. in the'method .of making reinforced filledbobbins, which consists in placing an elongated tube 'of indeter ininatelength on a support, coating said tube with an adhesive, Stringing. onthe coated tube aplurality of 4incomplete bobbins, each including atubularcore of `larger diameter than the tube, athread mass wound on thecore,"and a pair of heads having central in` les

